The only way to view text content is if you have backed the content up. The actual text messages are not stored for viewing. To obtain text content from Verizon requires legal stipulations to be met.
You can sync Verizon Messages on the computer with your cell phone and see texts from up to 90 days - if they have not been deleted from the device. You can also view them on the phone.
If the texts you want to view have already been deleted, and were not backed up anywhere, they are gone.
What texts are you wanting to see the content for? How old are the texts? Are they currently still on a phone?